docs: def __get_node(self, word):
  		"""
  		Private function retrieving a final node of trie
  		for given word
  
  		Returns node or None, if the trie doesn't contain the word.
  		"""
  
  		node = self.root
  		for c in word:
  			try:
  				node = node.children[c]
  			except KeyError:
  				return None
  
  		return node